My mind is open.
This is a list of what I consider to be my best / most useful answers and questions.
ANSWERS
QUESTIONS
https://math.stackexchange.com/questions/1633704/the-length-of-toilet-roll
https://math.stackexchange.com/questions/1896422/is-11-2-true-in-any-base
https://math.stackexchange.com/questions/1653979/is-there-any-integral-for-the-golden-ratio
https://math.stackexchange.com/questions/1634488/how-could-we-define-the-factorial-of-a-matrix